(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Publishing Venue

IBM

Related People

Engelbrecht, JC: AUTHOR

Abstract

An arrangement is described in which electromagnetic interference (EMI) on a circuit board is controlled by shielding only the noisy components and by filtering the electrical penetrations of the shield. A combination of board-mounted shields and filters are used to control EMI that radiates from circuitry on a printed circuit board. The shields are lightweight, 0.01" copper shields soldered into a circuit board. One application is on a CRT-neck-mounted video amplifier that delivers to the CRT electron gun a 45 V swing at a 16.3 MHz pel rate. Another application is over the fast, noisy Schottky modules on a personal computer adapter card. The shields are bent up from flat, copper-sheet patterns into low-walled, 5-sided boxes. The open side of each box has solder pins spaced at 0.

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

This is the abbreviated version, containing approximately
51% of the total text.

An arrangement is described in which electromagnetic interference (EMI) on a
circuit board is controlled by shielding only the noisy components and by filtering
the electrical penetrations of the shield. A combination of board-mounted shields
and filters are used to control EMI that radiates from circuitry on a printed circuit
board. The shields are lightweight, 0.01" copper shields soldered into a circuit
board. One application is on a CRT-neck-mounted video amplifier that delivers
to the CRT electron gun a 45 V swing at a 16.3 MHz pel rate. Another
application is over the fast, noisy Schottky modules on a personal computer
adapter card. The shields are bent up from flat, copper-sheet patterns into low-
walled, 5-sided boxes. The open side of each box has solder pins spaced at 0.6"
intervals, and the pins are soldered into ground-plane holes on the circuit board.
One shield is wave-soldered on the component side of the board, and the other
shield is hand-soldered on the solder side of the board. This combination of
shields completely surrounds the EMI-producing components and gives effective
EMI reduction. The shields are complemented by filtering. On the video
amplifier, control, CRT-biasing, and signal leads enter into the shielded area as
etched traces on the board. These leads are potential escape routes for the EMI
that is contained within the shields. To prevent EMI from getting out on these
leads, the control and biasing signals are filtered with RC or LC filters at the walls
of the shields. The signal leads are...